CA1160764A - Spacer grid corner gusset - Google Patents
Spacer grid corner gussetInfo
- Publication number
- CA1160764A CA1160764A CA000386519A CA386519A CA1160764A CA 1160764 A CA1160764 A CA 1160764A CA 000386519 A CA000386519 A CA 000386519A CA 386519 A CA386519 A CA 386519A CA 1160764 A CA1160764 A CA 1160764A
- Authority
- CA
- Canada
- Prior art keywords
- grid
- strip
- strips
- exterior
- spacer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/334—Assembling, maintenance or repair of the bundles
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/34—Spacer grids
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/34—Spacer grids
- G21C3/356—Spacer grids being provided with fuel element supporting members
- G21C3/3563—Supporting members formed only by deformations in the strips
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
ABSTRACT OF THE DISCLOSURE
A spacer grid for a nuclear fuel assembly wherein hangup between diagonally adjacent fuel assemblies in the reactor core during loading and unloading is essentially precluded by providing an inclined plane deflection surface at each corner of the spacer grid.
A spacer grid for a nuclear fuel assembly wherein hangup between diagonally adjacent fuel assemblies in the reactor core during loading and unloading is essentially precluded by providing an inclined plane deflection surface at each corner of the spacer grid.
Description
B~CKGROUND OF THE INVENTION
The invention relates to nuclear power systems, and more particularly to grid structures for nuclear reactor fuel assemblies and the like.
The core of a nuclear reactor typically includes a plurality of fuel assemblies arranged in close spaced relationship in an array the periphery of which approximates a cylinder. These fuel assemblies for a nuclear reactor typically include a plurality of elongated fuel rods held in spaced relationship in an array by a plurality of spacer grids.
To load or unload a fuel assembly into or from the reactor core, it is necessary to move the fuel assembly with respect to fuel assemblies adjacent thereto. This relative movement of adjacent fuel assemblies has resulted in the problem of hangup between the spacer grids of the adjacent assemblies. This hangup can occur between the sides of spacer grids of laterally adjacent fuel assemblies or between the corners of spacer grids of diagonally adjacent fuel assemblies. This hangup can result in irreparable damage to spacer grids, fuel rods, and may leave torn away pieces in the core which must be retrieved.
Many attempts have been made in the prior art to solve the problem of handling interaction and strength of fuel assembly spacer grids. The prior art solution to the problem of hangup between diagonally adjacent assemblies at the corners of the ~L
q~
l 16076~
spacer grids has been to chamfer the upper and lower corners of the exterior grid strip. This configuration is superior to the unchamfered configuration but does not completely eliminate the possibility of diagonal hangup.
SUMMARY OF THE INVENTION
The present invention overcomes the problem of diagonal hangup by preferably providing an inclined surface gusset at the upper and lower corners of the outer grid strip. In one embodiment this surface is provided by shaping the upper and lower corners of the exterior grid strips. The corner gusset prevents corner hangup and also strengthens the corner.
An object of the present invention is an improved spacer grid preferably for a nuclear fuel assembly.
A further object of the preferred embodiments of the invention is to provide a spacer grid wherein corner lead in and stand off are sufficient to avoid hangup between fuel assemblies having like spacer grid designs.
Another object of preferred embodiments of the invention is to provide a spacer grid yielding the foregoing advantages and in which the corner-to-corner hangup potential is minimized for fuel assemblies employing unlike spacer grid designs.
Yet another object of preferred embodiments of the invention is to provide a spacer grid which yields the foregoing advantages and which employs an inclined corner gusset to strengthen the grid whereby should interaction occur the likelihood of grid damage is reduced.
In accordance with the present invention there is provided a spacer grid for a bundle of longitudinally extending rods in spaced generally parallel relationship comprising spacing means l 1807B4 for holding the rods in spaced generally parallel relationship;
said spacing means including at least one exterior grid strip circumscribing the bundle of rods along the periphery thereof;
said at least one exterior grid strip having a first edge defining the boundary of said strip in one longitudinal direction and a second edge defining the boundary of said strip in the other longitudinal direction; said at least one exterior grid strip having at least one band formed therein parallel to the longitudinal direction; a plurality of corner gussets truncating each of a plurality of corners formed by said at least one band and said first edge and said second edge.
The above objects and advantages of the present invention will be readily apparent from the following description and drawings which illustrate a preferred embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view showing a portion of an array of nuclear fuel assemblies.
FIG. 2 is a partial elevation view showing diagonally adjacent fuel assemblies having spacer grids of the prior art.
FIG. 3 is a partial elevation view showing another spacer grid of the prior art.
FIG. 4 is a partial elevation view showing yet another spacer grid of the prior art.
FIG. 5 is a partial perspective view showing a spacer grid according to the preferred embodiment of the present invention.
FIG. 6 is a partial plan view of the spacer grid of FIG. 5.
FIG. 7 is a partial elevation view showing diagonally adjacent fuel assemblies having spacer grids according to the ~ 160764 preferred embodiment of the present invention.
FIG. 8 is a partial elevation view showing diagonally adjacent fuel assemblies one having a spacer grid according to the preferred embodiment of the present invention.
DESCRIPTION OF T~IE PREFERRED E~BODIMENT
Refer to FIG. 1 wherein the plan view of a core of fuel assemblies 11 is illustrated. The spacer grids of the diagonally adjacent fuel assemblies 10 to 12 may hang up at the corner indicated by arrow 2 upon their relative movement.
Turn now to FIG. 2 which shows an elevation view of diagonally adjacent fuel assemblies 10 and 12 viewed in the direction of arrow 2 of FIG. 1. Spacer grids 20 and 22 of the prior art hold fuel rods 13 in an array in spaced parallel relationship. Relative motion of the assemblies 10 and 12 are represented by arrows 21 and 23 respectively.
No lead-in chamfer is provided in FIG. 2, and should diagonally adjacent fuel assemblies 10 and 12 contact while assemblies 10 and 12 are being inserted or withdrawn from core 11, hangup damage to grids 20 and 22 is extremely likely.
FIG. 3 shows one arrangement of the prior art wherein chamfers 32 are provided in the corners of spacer grid 30. The corner represented in FIG. 3 possesses a shallow lead-in chamfer which reduces the potential for hangup, but there is still the probability of corner damage should diagonally adjacent fuel assemblies contact. The chamfer angle for keyable spacer grids is limited by the constraints imposed by the keying window and soft stop dimensional requirements. As such, the lead-in angle is too shallow to develop effective lateral forces to separate the fuel assemblies when contact occurs, and grid damage may result.
l 160764 FIG . 4 depicts a corner configuration which overcomes the disadvantage of the shallow chamfer angle by providing a short steep chamfer on the tips of the corners 42 of grid 40. This configuration has not been used because of the likelihood that the unsupported top points 44 of the chamfer would snag on adjacent grids and thereby cause an even more severe grid damage problem. Accordingly, chamfers 42 and 32 of FIGS. 3 and 4 do not solve the hangup problem between spacer grids of diagonally adjacent fuel assemblies.
Turn now to FIG~ 5 wherein a preferred embodiment of the invention is shown. Spacer grid 50 includes a plurality of interlacing interior grid strips 55. Exterior grid strips 56 and 54 as well as interior grid strips 55 are provided with stops 58 for supporting fuel rods in the cells formed by strips 54, 55 and 56 in a known manner. Grid 50 is a keyable type and thus key windows 62 are provided. A number of slight bends 60 in exterior strips 54 and 56 define the longitudinal limits of windows 62.
The prior method of joining exterior grid strips at a 90 degree angle has been improved by the formation of an angled joint, gusset 52, which slopes across the corner of the spacer grid 50 formed by the joining of exterior strips 54 and 56 at seam 61. The design according to the present invention in addition to having a steep gusset angle a (FIG. 8) has a relatively steep edge 57 the combination of which effectively separates the interacting diagonally adjacent fuel assemblies and thereby precludes hangup.
The angle a of the corner gusset 52 is such that when two diagonally adjacent assemblies each having like grids 50 interact as in FIG. 7 corner hangup is extremely unlikely.
The present invention is also designed to provide resistance to corner hangup with assemblies of the prior art design.
l 160764 FIG. 8 demonstrates the corner interaction of unlike assemblies, one employing grid 50 of Fig. 5 and the other employing the prior art grid 30 like that shown in FIG. 3~ The likelihood of hangup is reduced in these circumstances but should it occur, corner gusset 52 strengthens the corner of grid 50 and significantly reduces the likelihood of corner damage thereto.
FIG. 6 shows a plan view of the corner of grid 50 of FIG.
5 according to the present invention. In this view it can be seen that plane 52 is formed by contoured grid strips 56 and 54 which overlap at seam 61. Seam 61 is typically effective by welding.
Spacer grid 50 of FIG. 5 is of the keyable type. Grid 50 was used for illustrative purposes only and the invention of providing the corner gusset to both strengthen the grid and minimize corner-to-corner hangup may be employed in any type of spacer grid design.
The above-description and drawings are only illustrative of one embodiment which achieves the objects, features and advantages of the present invention, and it is not intended that the present invention be limited thereto. Any modification of the present invention which comes within the spirit and scope of the following claims is considered part of the present invention.
The invention relates to nuclear power systems, and more particularly to grid structures for nuclear reactor fuel assemblies and the like.
The core of a nuclear reactor typically includes a plurality of fuel assemblies arranged in close spaced relationship in an array the periphery of which approximates a cylinder. These fuel assemblies for a nuclear reactor typically include a plurality of elongated fuel rods held in spaced relationship in an array by a plurality of spacer grids.
To load or unload a fuel assembly into or from the reactor core, it is necessary to move the fuel assembly with respect to fuel assemblies adjacent thereto. This relative movement of adjacent fuel assemblies has resulted in the problem of hangup between the spacer grids of the adjacent assemblies. This hangup can occur between the sides of spacer grids of laterally adjacent fuel assemblies or between the corners of spacer grids of diagonally adjacent fuel assemblies. This hangup can result in irreparable damage to spacer grids, fuel rods, and may leave torn away pieces in the core which must be retrieved.
Many attempts have been made in the prior art to solve the problem of handling interaction and strength of fuel assembly spacer grids. The prior art solution to the problem of hangup between diagonally adjacent assemblies at the corners of the ~L
q~
l 16076~
spacer grids has been to chamfer the upper and lower corners of the exterior grid strip. This configuration is superior to the unchamfered configuration but does not completely eliminate the possibility of diagonal hangup.
SUMMARY OF THE INVENTION
The present invention overcomes the problem of diagonal hangup by preferably providing an inclined surface gusset at the upper and lower corners of the outer grid strip. In one embodiment this surface is provided by shaping the upper and lower corners of the exterior grid strips. The corner gusset prevents corner hangup and also strengthens the corner.
An object of the present invention is an improved spacer grid preferably for a nuclear fuel assembly.
A further object of the preferred embodiments of the invention is to provide a spacer grid wherein corner lead in and stand off are sufficient to avoid hangup between fuel assemblies having like spacer grid designs.
Another object of preferred embodiments of the invention is to provide a spacer grid yielding the foregoing advantages and in which the corner-to-corner hangup potential is minimized for fuel assemblies employing unlike spacer grid designs.
Yet another object of preferred embodiments of the invention is to provide a spacer grid which yields the foregoing advantages and which employs an inclined corner gusset to strengthen the grid whereby should interaction occur the likelihood of grid damage is reduced.
In accordance with the present invention there is provided a spacer grid for a bundle of longitudinally extending rods in spaced generally parallel relationship comprising spacing means l 1807B4 for holding the rods in spaced generally parallel relationship;
said spacing means including at least one exterior grid strip circumscribing the bundle of rods along the periphery thereof;
said at least one exterior grid strip having a first edge defining the boundary of said strip in one longitudinal direction and a second edge defining the boundary of said strip in the other longitudinal direction; said at least one exterior grid strip having at least one band formed therein parallel to the longitudinal direction; a plurality of corner gussets truncating each of a plurality of corners formed by said at least one band and said first edge and said second edge.
The above objects and advantages of the present invention will be readily apparent from the following description and drawings which illustrate a preferred embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view showing a portion of an array of nuclear fuel assemblies.
FIG. 2 is a partial elevation view showing diagonally adjacent fuel assemblies having spacer grids of the prior art.
FIG. 3 is a partial elevation view showing another spacer grid of the prior art.
FIG. 4 is a partial elevation view showing yet another spacer grid of the prior art.
FIG. 5 is a partial perspective view showing a spacer grid according to the preferred embodiment of the present invention.
FIG. 6 is a partial plan view of the spacer grid of FIG. 5.
FIG. 7 is a partial elevation view showing diagonally adjacent fuel assemblies having spacer grids according to the ~ 160764 preferred embodiment of the present invention.
FIG. 8 is a partial elevation view showing diagonally adjacent fuel assemblies one having a spacer grid according to the preferred embodiment of the present invention.
DESCRIPTION OF T~IE PREFERRED E~BODIMENT
Refer to FIG. 1 wherein the plan view of a core of fuel assemblies 11 is illustrated. The spacer grids of the diagonally adjacent fuel assemblies 10 to 12 may hang up at the corner indicated by arrow 2 upon their relative movement.
Turn now to FIG. 2 which shows an elevation view of diagonally adjacent fuel assemblies 10 and 12 viewed in the direction of arrow 2 of FIG. 1. Spacer grids 20 and 22 of the prior art hold fuel rods 13 in an array in spaced parallel relationship. Relative motion of the assemblies 10 and 12 are represented by arrows 21 and 23 respectively.
No lead-in chamfer is provided in FIG. 2, and should diagonally adjacent fuel assemblies 10 and 12 contact while assemblies 10 and 12 are being inserted or withdrawn from core 11, hangup damage to grids 20 and 22 is extremely likely.
FIG. 3 shows one arrangement of the prior art wherein chamfers 32 are provided in the corners of spacer grid 30. The corner represented in FIG. 3 possesses a shallow lead-in chamfer which reduces the potential for hangup, but there is still the probability of corner damage should diagonally adjacent fuel assemblies contact. The chamfer angle for keyable spacer grids is limited by the constraints imposed by the keying window and soft stop dimensional requirements. As such, the lead-in angle is too shallow to develop effective lateral forces to separate the fuel assemblies when contact occurs, and grid damage may result.
l 160764 FIG . 4 depicts a corner configuration which overcomes the disadvantage of the shallow chamfer angle by providing a short steep chamfer on the tips of the corners 42 of grid 40. This configuration has not been used because of the likelihood that the unsupported top points 44 of the chamfer would snag on adjacent grids and thereby cause an even more severe grid damage problem. Accordingly, chamfers 42 and 32 of FIGS. 3 and 4 do not solve the hangup problem between spacer grids of diagonally adjacent fuel assemblies.
Turn now to FIG~ 5 wherein a preferred embodiment of the invention is shown. Spacer grid 50 includes a plurality of interlacing interior grid strips 55. Exterior grid strips 56 and 54 as well as interior grid strips 55 are provided with stops 58 for supporting fuel rods in the cells formed by strips 54, 55 and 56 in a known manner. Grid 50 is a keyable type and thus key windows 62 are provided. A number of slight bends 60 in exterior strips 54 and 56 define the longitudinal limits of windows 62.
The prior method of joining exterior grid strips at a 90 degree angle has been improved by the formation of an angled joint, gusset 52, which slopes across the corner of the spacer grid 50 formed by the joining of exterior strips 54 and 56 at seam 61. The design according to the present invention in addition to having a steep gusset angle a (FIG. 8) has a relatively steep edge 57 the combination of which effectively separates the interacting diagonally adjacent fuel assemblies and thereby precludes hangup.
The angle a of the corner gusset 52 is such that when two diagonally adjacent assemblies each having like grids 50 interact as in FIG. 7 corner hangup is extremely unlikely.
The present invention is also designed to provide resistance to corner hangup with assemblies of the prior art design.
l 160764 FIG. 8 demonstrates the corner interaction of unlike assemblies, one employing grid 50 of Fig. 5 and the other employing the prior art grid 30 like that shown in FIG. 3~ The likelihood of hangup is reduced in these circumstances but should it occur, corner gusset 52 strengthens the corner of grid 50 and significantly reduces the likelihood of corner damage thereto.
FIG. 6 shows a plan view of the corner of grid 50 of FIG.
5 according to the present invention. In this view it can be seen that plane 52 is formed by contoured grid strips 56 and 54 which overlap at seam 61. Seam 61 is typically effective by welding.
Spacer grid 50 of FIG. 5 is of the keyable type. Grid 50 was used for illustrative purposes only and the invention of providing the corner gusset to both strengthen the grid and minimize corner-to-corner hangup may be employed in any type of spacer grid design.
The above-description and drawings are only illustrative of one embodiment which achieves the objects, features and advantages of the present invention, and it is not intended that the present invention be limited thereto. Any modification of the present invention which comes within the spirit and scope of the following claims is considered part of the present invention.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A spacer grid for a bundle of longitudinally extending rods in spaced generally parallel relationship comprising:
spacing means for holding the rods in spaced generally parallel relationship;
said spacing means including at least one exterior grid strip circumscribing the bundle of rods along the periphery thereof;
said at least one exterior grid strip having a first edge defining the boundary of said strip in one longitudinal direction and a second edge defining the boundary of said strip in the other longitudinal direction, said at least one exterior grid strip having at least one band formed therein parallel to the longitudinal direction;
a plurality of corner gussets truncating each of a plurality of corners formed by said at least one band and said first edge and said second edge.
spacing means for holding the rods in spaced generally parallel relationship;
said spacing means including at least one exterior grid strip circumscribing the bundle of rods along the periphery thereof;
said at least one exterior grid strip having a first edge defining the boundary of said strip in one longitudinal direction and a second edge defining the boundary of said strip in the other longitudinal direction, said at least one exterior grid strip having at least one band formed therein parallel to the longitudinal direction;
a plurality of corner gussets truncating each of a plurality of corners formed by said at least one band and said first edge and said second edge.
2. A spacer grid as in claim 1 wherein:
the bundle of rods is generally rectangular in cross-section and there are four of said at least one exterior grid strip each having two ends and each positioned on a corresponding side of the bundle and joined at the ends thereof to two of the other strips at respective rectangle corners.
the bundle of rods is generally rectangular in cross-section and there are four of said at least one exterior grid strip each having two ends and each positioned on a corresponding side of the bundle and joined at the ends thereof to two of the other strips at respective rectangle corners.
3. A spacer grid as in claim 2 wherein each of said corner gussets is formed from an adjacent pair of a plurality of strip corners defined by the intersection of the ends of said strips and the edges of said strips, said strip corners adjoining said strips and being angled and affixed together to form said truncating surfaces.
4. A spacer grid as in claim 3 wherein said spacing means is keyable and a plurality of key windows are provided in said exterior strips and some of said key windows occur at the rectangular corners and said exterior strips are adjoined to each other only by said truncating surfaces.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US209,087 | 1980-11-21 | ||
| US06/209,087 US4388269A (en) | 1980-11-21 | 1980-11-21 | Spacer grid corner gusset |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1160764A true CA1160764A (en) | 1984-01-17 |
Family
ID=22777272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000386519A Expired CA1160764A (en) | 1980-11-21 | 1981-09-23 | Spacer grid corner gusset |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4388269A (en) |
| EP (1) | EP0052924B1 (en) |
| JP (1) | JPS57146188A (en) |
| KR (1) | KR880000400B1 (en) |
| CA (1) | CA1160764A (en) |
| DE (1) | DE3164440D1 (en) |
| ES (1) | ES280860Y (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3330850A1 (en) * | 1983-08-26 | 1985-03-14 | Kraftwerk Union AG, 4330 Mülheim | CORE REACTOR FUEL ELEMENT |
| US4692302A (en) * | 1983-12-30 | 1987-09-08 | Westinghouse Electric Corp. | Coolant flow mixer grid for a nuclear reactor fuel assembly |
| DE3570548D1 (en) * | 1984-11-30 | 1989-06-29 | Siemens Ag | Nuclear reactor fuel element |
| US4659535A (en) * | 1984-12-24 | 1987-04-21 | Combustion Engineering, Inc. | Grid structure for fuel rod consolidation canister |
| FR2608827B1 (en) * | 1986-04-02 | 1990-06-15 | Framatome Sa | SPACING GRILLE FOR NUCLEAR FUEL ASSEMBLY |
| JP2522475B2 (en) * | 1987-05-28 | 1996-08-07 | 株式会社東芝 | Fuel assembly |
| US4873051A (en) * | 1988-04-06 | 1989-10-10 | Westinghouse Electric Corp. | Nuclear fuel grid outer strap |
| SE464995B (en) * | 1989-11-14 | 1991-07-08 | Asea Atom Ab | BRAINSLEPATRON FOR A COOKAR REACTOR |
| US5061437A (en) * | 1991-01-24 | 1991-10-29 | B&W Fuel Company | Grid key for exterior grid cells |
| US5271054A (en) * | 1991-09-25 | 1993-12-14 | Combustion Engineering, Inc. | Perimeter grid strip |
| JPH0647803U (en) * | 1992-12-08 | 1994-06-28 | 宣夫 福久 | Position detector |
| FR2878645B1 (en) * | 2004-11-30 | 2007-02-09 | Framatome Anp Sas | PEN HOLDING GRID FOR NUCLEAR FUEL ASSEMBLY AND CORRESPONDING ASSEMBLY |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE315342B (en) * | 1965-05-24 | 1969-09-29 | Asea Ab | |
| US3338791A (en) * | 1965-06-07 | 1967-08-29 | Gen Electric | Reactor device |
| FR1584335A (en) * | 1968-07-02 | 1969-12-19 | ||
| US3751335A (en) * | 1970-06-01 | 1973-08-07 | Continental Oil Co | Nuclear reactor fuel element spacer assembly |
| GB1362546A (en) * | 1970-07-24 | 1974-08-07 | United Nuclear Corp | Spacer and grid assembly for nuclear reactors |
| BE791809A (en) * | 1971-12-13 | 1973-05-23 | Babcock & Wilcox Co | CELLULAR GRID STRUCTURE FOR ACTIVE NUCLEAR REACTOR CARTRIDGE |
| US3932216A (en) * | 1971-12-13 | 1976-01-13 | The Babcock & Wilcox Company | Industrial technique |
| FR2337407A1 (en) * | 1975-12-31 | 1977-07-29 | Commissariat Energie Atomique | Fuel rod assembly for nuclear reactor - prevents damage by own weight and permits use of aluminium alloy sheaths |
| US4155807A (en) * | 1976-09-22 | 1979-05-22 | Westinghouse Electric Corp. | Core and transition fuel assembly for a nuclear reactor |
-
1980
- 1980-11-21 US US06/209,087 patent/US4388269A/en not_active Expired - Lifetime
-
1981
- 1981-09-16 DE DE8181304250T patent/DE3164440D1/en not_active Expired
- 1981-09-16 EP EP81304250A patent/EP0052924B1/en not_active Expired
- 1981-09-23 CA CA000386519A patent/CA1160764A/en not_active Expired
- 1981-10-05 KR KR1019810003737A patent/KR880000400B1/en active
- 1981-10-29 ES ES1981280860U patent/ES280860Y/en not_active Expired
- 1981-11-20 JP JP56185543A patent/JPS57146188A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| KR830008330A (en) | 1983-11-18 |
| EP0052924B1 (en) | 1984-06-27 |
| JPS57146188A (en) | 1982-09-09 |
| ES280860U (en) | 1985-09-01 |
| US4388269A (en) | 1983-06-14 |
| KR880000400B1 (en) | 1988-03-21 |
| EP0052924A1 (en) | 1982-06-02 |
| JPS6239958B2 (en) | 1987-08-26 |
| DE3164440D1 (en) | 1984-08-02 |
| ES280860Y (en) | 1986-05-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |